Rotorsport UK MTOSport, G-CGEW
The student was being instructed on how to control the build up of rotor speed without the pre- rotator. He was instructed to pull the stick back gently with the rotor speed at approximately 100 rpm. He followed this instruction and gently pulled the stick fully back with the aircraft on the ground and moving forward slowly. This resulted in the rotor striking the fin.
The Pilots’ Operating Handbook states: __
_‘Note that it is possible to operate without the pre rotator. In this situation, start the blades by hand to about 45rpm. Taxy slowly into wind, and, holding the stick back, let the rotor speed increase. It will take about 320m to reach over 200rpm, at which stage full power can be applied and normal take off.’__
However, this is at the bottom of the page and at the top of the next page it states:
‘WARNING! Take care! Holding the stick fully back brings the blades close to the rudder, and blade flap/ system flexibility, or bumpy surfaces could cause contact! About midway should be adequate, learn with practice!’
Rotorsport UK MTOSport, G-CGEW 10-11.pdf (290.64 kb)